mirror of https://github.com/linka-cloud/d2vm.git
271 lines
8.0 KiB
Markdown
271 lines
8.0 KiB
Markdown
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# d2vm (Docker to Virtual Machine)
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[](https://golang.org/)
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[](https://pkg.go.dev/go.linka.cloud/d2vm)
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[](https://matrix.to/#/#d2vm:linka.cloud)
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*Build virtual machine image from Docker images*
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The project is heavily inspired by the [article](https://iximiuz.com/en/posts/from-docker-container-to-bootable-linux-disk-image/) and the work done by [iximiuz](https://github.com/iximiuz) on [docker-to-linux](https://github.com/iximiuz/docker-to-linux).
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Many thanks to him.
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**Status**: *alpha*
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[](https://asciinema.org/a/520132)
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## Supported Environments:
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**Only building Linux Virtual Machine images is supported.**
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**Starting from v0.1.0, d2vm automatically run build and convert commands inside Docker when not running on linux**.
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## Supported VM Linux distributions:
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Working and tested:
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- [x] Ubuntu (18.04+)
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- [x] Debian (stretch+)
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- [x] Alpine
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- [x] CentOS (8+)
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Unsupported:
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- [ ] RHEL
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The program uses the `/etc/os-release` file to discover the Linux distribution and install the Kernel,
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if the file is missing, the build cannot succeed.
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Obviously, **Distroless** images are not supported.
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## Getting started
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### Install from release
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Download the latest release for your platform from the [release page](https://github.com/linka-cloud/d2vm/releases/latest)
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### Install from source
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Clone the git repository:
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```bash
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git clone https://github.com/linka-cloud/d2vm && cd d2vm
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```
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Install using the *make*, *docker* and the Go tool chain:
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```bash
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make build-dev && sudo cp d2vm /usr/local/bin/
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```
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### Converting an existing Docker Image to VM image:
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```bash
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d2vm convert --help
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```
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```
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Convert Docker image to vm image
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Usage:
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d2vm convert [docker image] [flags]
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Flags:
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--append-to-cmdline string Extra kernel cmdline arguments to append to the generated one
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-f, --force Override output qcow2 image
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-h, --help help for convert
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--network-manager string Network manager to use for the image: none, netplan, ifupdown
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-o, --output string The output image, the extension determine the image format, raw will be used if none. Supported formats: qcow2 qed raw vdi vhd vmdk (default "disk0.qcow2")
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-p, --password string The Root user password (default "root")
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--pull Always pull docker image
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--raw Just convert the container to virtual machine image without installing anything more
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-s, --size string The output image size (default "10G")
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Global Flags:
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-t, --time string Enable formated timed output, valide formats: 'relative (rel | r)', 'full (f)' (default "none")
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-v, --verbose Enable Verbose output
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```
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Create an image based on the **ubuntu** official image:
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```bash
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sudo d2vm convert ubuntu -o ubuntu.qcow2 -p MyP4Ssw0rd
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```
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```
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Pulling image ubuntu
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Inspecting image ubuntu
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No network manager specified, using distribution defaults: netplan
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Docker image based on Ubuntu 22.04.1 LTS (Jammy Jellyfish)
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Building kernel enabled image
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Creating vm image
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Creating raw image
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Mounting raw image
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Creating raw image file system
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Copying rootfs to raw image
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Setting up rootfs
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Installing linux kernel
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Unmounting raw image
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Writing MBR
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Converting to qcow2
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```
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You can now run your ubuntu image using the created `ubuntu.qcow2` image with **qemu**:
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```bash
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d2vm run qemu ubuntu.qcow2
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```
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```
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SeaBIOS (version 1.13.0-1ubuntu1.1)
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iPXE (http://ipxe.org) 00:03.0 CA00 PCI2.10 PnP PMM+BFF8C920+BFECC920 CA00
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Booting from Hard Disk...
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SYSLINUX 6.04 EDD 20191223 Copyright (C) 1994-2015 H. Peter Anvin et al
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Now booting the kernel from SYSLINUX...
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Loading /boot/vmlinuz... ok
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Loading /boot/initrd.img...ok
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[ 0.000000] Linux version 5.4.0-109-generic (buildd@ubuntu) (gcc version 9)
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[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz ro root=UUID=b117d206-b8
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[ 0.000000] KERNEL supported cpus:
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[ 0.000000] Intel GenuineIntel
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[ 0.000000] AMD AuthenticAMD
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[ 0.000000] Hygon HygonGenuine
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[ 0.000000] Centaur CentaurHauls
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[ 0.000000] zhaoxin Shanghai
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...
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Welcome to Ubuntu 20.04.4 LTS!
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[ 3.610631] systemd[1]: Set hostname to <localhost>.
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[ 3.838984] systemd[1]: Created slice system-getty.slice.
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[ OK ] Created slice system-getty.slice.
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[ 3.845038] systemd[1]: Created slice system-modprobe.slice.
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[ OK ] Created slice system-modprobe.slice.
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[ 3.852054] systemd[1]: Created slice system-serial\x2dgetty.slice.
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[ OK ] Created slice system-serial\x2dgetty.slice.
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...
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Ubuntu 20.04.4 LTS localhost ttyS0
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localhost login:
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```
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Log in using the *root* user and the password configured at build time.
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```
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localhost login: root
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Password:
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Welcome to Ubuntu 20.04.4 LTS (GNU/Linux 5.4.0-109-generic x86_64)
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* Documentation: https://help.ubuntu.com
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* Management: https://landscape.canonical.com
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* Support: https://ubuntu.com/advantage
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This system has been minimized by removing packages and content that are
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not required on a system that users do not log into.
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To restore this content, you can run the 'unminimize' command.
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The programs included with the Ubuntu system are free software;
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the exact distribution terms for each program are described in the
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individual files in /usr/share/doc/*/copyright.
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Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
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applicable law.
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root@localhost:~#
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```
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Type `poweroff` to shut down the vm.
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### Building a VM Image from a Dockerfile
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The example directory contains very minimalistic examples:
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```bash
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cd examples
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```
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*ubuntu.Dockerfile* :
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```dockerfile
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FROM ubuntu
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RUN apt update && apt install -y openssh-server && \
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echo "PermitRootLogin yes" >> /etc/ssh/sshd_config
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```
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When building the vm image, *d2vm* will create a root password, so there is no need to configure it now.
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Build the vm image:
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The *build* command take most of its flags and arguments from the *docker build* command.
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```bash
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d2vm build --help
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```
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```
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Build a vm image from Dockerfile
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Usage:
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d2vm build [context directory] [flags]
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Flags:
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--append-to-cmdline string Extra kernel cmdline arguments to append to the generated one
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--build-arg stringArray Set build-time variables
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-f, --file string Name of the Dockerfile
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--force Override output image
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-h, --help help for build
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--network-manager string Network manager to use for the image: none, netplan, ifupdown
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-o, --output string The output image, the extension determine the image format, raw will be used if none. Supported formats: qcow2 qed raw vdi vhd vmdk (default "disk0.qcow2")
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-p, --password string Root user password (default "root")
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--raw Just convert the container to virtual machine image without installing anything more
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-s, --size string The output image size (default "10G")
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Global Flags:
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-t, --time string Enable formated timed output, valide formats: 'relative (rel | r)', 'full (f)' (default "none")
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-v, --verbose Enable Verbose output
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```
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```bash
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sudo d2vm build -p MyP4Ssw0rd -f ubuntu.Dockerfile -o ubuntu.qcow2 .
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```
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Or if you want to create a VirtualBox image:
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```bash
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sudo d2vm build -p MyP4Ssw0rd -f ubuntu.Dockerfile -o ubuntu.vdi .
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```
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### Complete example
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A complete example setting up a ZSH workstation is available in the [examples/full](examples/full/README.md) directory.
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### Internal Dockerfile templates
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You can find the Dockerfiles used to install the Kernel in the [templates](templates) directory.
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### TODO / Questions:
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- [ ] Create service from `ENTRYPOINT` `CMD` `WORKDIR` and `ENV` instructions ?
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- [ ] Inject Image `ENV` variables into `.bashrc` or other service environment file ?
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- [x] Use image layers to create *rootfs* instead of container ?
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### Acknowledgments
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The *run* commands are adapted from [linuxkit](https://github.com/docker/linuxkit).
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